JPS5924868A - Device for preventing transfer defect of toner image - Google Patents

Abstract

PURPOSE:To prevent a transfer defect, especially, at high moisture, by providing a brush on a cover of a pretransfer lamp for preventing a transfer defect so that the optical path of the lamp is not intercepted by the brush and preventing a toner from sticking to the light emitting face of the lamp. CONSTITUTION:The pretransfer lamp (PTL) 9 for preventing the transfer defect which gives an intense light beam to a photoreceptor 3 to weaken the electric charge of an electrostatic latent image is provided between a developing machine 5 and a from guide plate 4, and a floating toner is stuck to the light emitting face of the PTL 9 by the air current generated when the photoreceptor 3 is rotated. Therefore, the cover 7 is provided with a conductive brush 8 so that the optical path of the PTL 9 is not intercepted by the brush 8. Thus, the floating toner and paper powder are caught mechanically or electrostatically by the brush 8 to prevent the quantity of light from being uneven by the dirt of the light emitting face, and a sufficient quantity of light is given to the photoreceptor 3, and the transfer defect is effectively prevented at high moisture especially.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing defective toner image transfer, and particularly relates to a pre-transfer device used as a countermeasure against defective toner image transfer when the environment is high temperature and high humidity. 7
This is a lock on a toner image transfer failure prevention device designed to prevent Alain 7° (hereinafter referred to as PTL) stains.

One of the transfer methods used in most current copying machines is the corotron transfer method, which is an electrostatic method. Here, the corotron transfer method will be briefly explained.

Figure 1 shows the nl and turning of the generally used transfer system, and Figure 2 shows the relationship between the transfer current, which is the force exerted by the transfer corotron, and the transfer efficiency.
+, and t:'t tllll is the transfer current, X[(1I
Apply the paper 2 to the toner image on the photoreceptor, which has a transfer effect of ζ, on ll+, and press the transfer core 1 with Cυ′l (l!
Transfer f#ξ to paper 2 once a month. 4 is a paper guide plate.

At that time, as shown in Figure 2, if the transfer '+tt current is at the small-filling stage, transfer is almost impossible, but if it exceeds a certain value, the transfer rate increases in proportion to the current. Then, at a certain point, it becomes saturated.

In fact, when there is no paper, the force that moves the toner at the photoreceptor opening is considered to be the sum of the electrostatic Coulomb force due to the toner's own charge and the non-static intermolecular force.

? r<3 Figures (1) to (1) are explanatory diagrams regarding the static YIY potentiometer of the L1 transfer mechanism. Figure 3 (1
) is transcribed by IJ)・Ron 1 ↑LC? The state of the stand f+j! where li; is not given! 1-''', the toner is on the slope of the mountain of minus l'lf, created by the toner itself, and it falls into the valley on the left, but since there is a photoconductor 3, it is blocked by this and is stabilized by fL. I have been in a bad situation for a while now.

Next, is there a current in l'l'J nQ transcription corotron 1? I
When f, starts to fall, Fig. 3 (U), x in (1), '>v
The shape of the peak c forms a steep valley toward the paper 2.

12, 12, 7t LMIC is small stage lii K-11 Figure 3 (11) rC
Toner LL1 is exposed to contact with the 0 side (because there is energy falling into the valley in the 11'7 direction in the main area, it is transferred in a balanced manner).

In addition, when the transfer mold 3M has reached stage 1!
This I gave me enough energy to fall into the valley on the side.
I;'1, most of the toner on photoreceptor 3&, t/1
1, transferred to Tic 2/J'. That is, the transfer depends on the energy balance of the toner, the photosensitive member, the paper 2, and the energy of the toner.

In addition to the transfer current such as
As for the weather conditions, 11" yen, humidity); be praised.

If the surrounding area is highly humid and the monthly paper receives 3 to 100% of water, 11 ions will be absorbed, and the load will exhibit poor transfer, resulting in poor transfer. I'm sorry that happened.

Specifically, as shown by arrow A in FIG.
The electrostatic image of the photoreceptor 3 causes the sheet 2 and the photoreceptor 3J to flow away to the inner plate 4 (usually a grounded metal plate), or as shown by arrow B. (
)+j'f surface "(11 charge caused by 6, Jj gill from the transfer corotron 1) (1 charge attracts L
), a charge flow occurs, and the above ([) charge force! There is a phenomenon in which the number decreases.

Therefore, the valley on the paper 2 side shown in Figure 53 is the third valley.
Figure 01).
Since it is difficult to reach the eel-shaped store 1, the transfer defect force <2
1-Yumi Koro.

j;゛1 Oboro A 1'irr As a countermeasure for transfer failure when wet 7
Then, -n length V, the next method is 2h Gera JL.

■ 21) of paper, reduction of main processing ■ D of paper guide 1ν (anti-grounding) ■ 1) J' of T1, (using 1) The present invention relates to IJ1j 1"1' L - 1 also 0) -
(“ai)/辷, 1/), P T J, will be explained next.

Figure D1S4 is (IUU IL, (υ TONAI''!Jl's change), (H26o)
B Shibe I - Show 1 - ((Two also abbreviated l ino
-C, Senro.

Figure 1-c, j (No. 21, which is the same as Figure 1, has been cut and divided into parts 5 and 1).

5 is υ mouth & 41L 6 is 101 'a current work 1λ Akebonai kc setting 1] and toner 5: feeling)! :F on the front of body 5
A cover of 8 P'r T and 9 is provided on the downstream side of the developing machine 5 and the location of the I-column is 1 cola and 7 t.

1) The function of T L 9 is 1) Arrow 1 in Figure 1 of Book IJ
31゛In order to eliminate the phenomenon of influx of wasteful cargo, Sense 5
1. To do this, apply intense light to the entire surface of the toner and weaken the electrostatic latent image. However, as mentioned above, 1' L 9
Generally, it is installed on the bIL side just below the developing part (i):45, so that floating toner, paper dust, etc. may be deposited on the surface of the (1)l:f L.

I often got it dirty.

(Accordingly, in such a case, the pattern of PTL 9 for the photoreceptor 1.1 and 2 will be non-uniform, or Q, [decreasingly formed on the photoreceptor 6]1. The function of drowning out the electrostatic latent image is not sufficiently performed.

The purpose of the present invention is to eliminate all of the drawbacks listed in 1 and 4. 2. To prevent PTL from performing properly due to dirt on the light emitting surface, which is a method for dealing with transfer defects. 2. To prevent rain. An object of the present invention is to provide a means for preventing defective transfer of a toner image.

To achieve the above object, the present invention provides L) IM writing PTI so as not to block the optical path from the TL to the photoreceptor.

A brush is provided on the part of the cover facing the photoreceptor, and this brush removes floating toner particles and paper powder from the light emitting surface p of the PTL.
It is characterized by the fact that it does not stick.

Embodiments of the present invention will now be described with reference to the accompanying drawings.

FIG. 5 is a perspective view of one embodiment of the present invention. In FIG. 1c, 8 is P '1' I, and all of the parts of the cover 7 of 9 facing the photoreceptor (not shown) are provided with a front ffri P
'II' This is, for example, a conductive brush provided in a way that does not block the optical path of L9.

Nafu, as mentioned above, "C1i brush 8t is not necessarily +1iJ &;Q'J must be installed on all parts of the cover 7 of PTL 9 facing the photoreceptor.
It is clear that you can give up on the appropriate appeal if necessary.

Figure MS6 is a schematic cross-sectional view showing the main parts of a copying machine equipped with means for preventing defective transfer of Tner (!!) according to a modified example of the present invention. No. v'1
, have the same or equivalent parts. 18t:
For example, one electric brush is provided at both short sides and one long side (H) of the portion of the cover 7 of the IPTL 9 facing the photoreceptor 3 at a distance of 1°.

As mentioned above, inside the copying machine, floating toner, paper powder, etc. flow into the vicinity of the light surface of P T L 9 on the air 61 rjt (arrow a in the figure) generated when the light sensor 1+3 rotates. , the above-mentioned floating toner and paper dust are
7? , 7 L x trying to sleep.

However, in the present invention, the conductive brush 8 or 18 is provided on the portion of the cover 7 of the PTL 9 facing the photoreceptor () so as not to interfere with the optical path of the P'r L 9. j
Therefore, the floating toner and paper dust are captured by the mechanical tool 1.

For example, since there is mud in the space near P T L 9, carried by the air flow (a), the floating brush 8 or 18, it is possible to electrostatically capture a considerable amount of toner.

Na trivia, t! 1 If you are happy with yourself,)) T L
Brush & L provided on cover 7 of 9. 7 is also included;! L'IM MUST BE SEXUAL 9. i! ): It is natural that there is no kt.

In the present invention, in the Z) portion of the cover of P''I'L opposite to the photoreceptor PC, a light beam of -6 μ℃ is applied to the Z) portion of the cover of P''I'L that faces the photoreceptor PC. Clean the brush in general. L
As a result, it is possible to reduce the unevenness and decrease of the surface dirt.

Therefore, l photoreceptor surface''-90,1 unit・-7i,
CB'i': to do lIJ' ijI: to:! c.
It has the advantage of being able to prevent transfer failures that can occur over a period of 1 m high.

4. During the same song 'A"L 1i3).The quadruple 1 figure is -IC and f'L- (: An explanatory diagram of the color toner group transfer method. Figure 2 shows the relationship between transfer current and transfer efficiency. Indicative theory IJI719<1, E83 +7J<1) ~(
ri t, L transcription mechanic's static electricity +4? Regarding tensial: explanation (〆<1 , 4th ly?l !, l (i
755 is a perspective view of the third embodiment of the present invention; Figure 6 is a copy of a modified version of the present invention showing a means for preventing transfer defects in toner production.
In the figure, iY1 to (11) are approximately 1FJ7.

1... Transfer corotron, R... R substitute, 5...
Current 1zu [machine, 719. Cover, 8, 18...2. IL
Brush of L12-, 9... Pre-transfer rande agent Patent attorney Michihito Hiraki Evening 11 people Figure 1 Figure 2 [7.1 [7,+AI Figure 3 Figure 5 Figure 6 et al.

Claims (1)

[Claims] (1) A pre-transfer lamp installed between the developing machine and the transfer corotron that exposes the entire surface of the photoreceptor? 1) A brush is installed in the part of the cover of the pre-transformer 7 lamp facing the IJ photoreceptor so as not to follow the optical path of the pre-transfer lamp 7. An apparatus for preventing defective toner image transfer, characterized in that: 1.